Fig. 4.
Period spacings of the RGB star KIC 6144777. Top: plot as a function of the arithmetical mean value (ζ(νn)+ζ(νn + 1))/2. Bottom: plot as a function of the mean value ⟨ζ⟩n. The colors code the azimuthal orders, as in Fig. 2; the dashed line indicates the 1:1 relation; 1-σ uncertainties on both the spacings and the mean values of ζ are indicated by vertical and horizontal rror bars.
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